|Publication number||US5507223 A|
|Application number||US 08/242,440|
|Publication date||Apr 16, 1996|
|Filing date||May 13, 1994|
|Priority date||Feb 4, 1994|
|Also published as||CA2123723A1, CA2123723C, DE69414819D1, DE69414819T2, EP0666367A1, EP0666367B1|
|Publication number||08242440, 242440, US 5507223 A, US 5507223A, US-A-5507223, US5507223 A, US5507223A|
|Original Assignee||Valmet Paper Machinery, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (13), Referenced by (17), Classifications (12), Legal Events (6)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to a coupling construction for coupling press rolls forming a nip in which a large linear load exists, particularly an extended-nip, and a method for joining together a pair of rolls in a nip in which a large linear load exists, especially an extended-nip.
A press nip formed between a pair of extended-nip rolls typically consists of a pair of rolls such as SYM-ZL and SYM-BELT rolls. A special feature of an extended-nip is the high linear load applied therein to dewater the web. The maximum linear load is generally of an order of about 1200 kN/m. For such a relatively high linear load, a conventional screw coupling arrangement for the rolls is not possible, because, in order to overcome the linear load, roughly 130 screws per roll would be needed. This would be uneconomical in practice.
It is an object of the present invention to provide a new and improved method and device for coupling a pair of rolls forming a nip in extended-nip.
It is another object of the present invention to provide a new and improved coupling construction and method for joining a pair of rolls in an extended-nip which is sufficiently simple and easily operable and which coupling construction does not require a large amount of space.
It is yet another object of the present invention to provide a new and improved coupling construction and method for joining a pair of rolls in an extended-nip which enables one of the rolls to be easily serviceable and/or replaceable without significantly interfering with the positioning of the other roll.
Accordingly, to achieve these objects and others that will come out later, in the invention, tie members are provided to join together and couple the bearing housings of the rolls in a nip in which a large linear load exists, particularly an extended-nip press. The tie members are connected with the bearing-housing constructions so that, when the coupling is being uncoupled, the tie members can be pivoted into such a position that the uncoupled roll/mantle belt/bearing can be removed.
Each tie member is linked with one of the bearing housings. The tie member is arranged to pivot in relation to the bearing housing and so that the end of the tie member is locked by means of a wedge effect with the respective bearing housing. Movement of the tie member takes place by means of a hydraulic cylinder or other suitable pivot means. In a preferred embodiment, two tie members are employed at each roll end, and the coupling construction is symmetric in relation to the vertical central axis (Y axis) of the construction, which preferably aligns with axis passing through the center points of the press rolls in the extended-nip. Further, the coupling arrangement comprises an articulation point at each end of the tie member which permits the tie member to be operated as desired so that the tie member is linked in such a manner so as to be pivoted at either one of the bearing housings, either the upper or the lower bearing housing. In this manner, it is possible to condition/replace either the upper bearing housing or the lower bearing housing or to condition/replace either the upper roll or the lower roll. For example, it is easy to replace the belt mantle around the extended-nip press roll by uncoupling the connection between the bearing housings of this roll and pivoting the tie members about an articulation point in connection with the bearing housing of the back-up roll.
In the coupling construction and method in accordance with the invention, the ultimate fixing of the tie member to the constructions of the bearing housing is carried out by means of screw members or equivalent fastening means. In a corresponding manner, the uncoupling of the tie member from the friction joint is carried out, in the first stage, by means of the unscrewing of screw members or unfastening the equivalent fastening means. The shifting of the tie member itself apart from the bearing housing in operative engagement therewith takes place by means of a hydraulic cylinder.
The coupling construction in accordance with the invention is sufficiently simple and, yet, easily operable. Also, the coupling construction does not require a large amount of space and the nip forces do not have to be transferred to the frame constructions. In this case, an expensive and spacious outside frame system is not required providing additional savings. The coupling construction of the invention is also well suitable for modernizations of existing extended-nips.
In the method in accordance with the invention, the coupling construction between the extended-nip press rolls comprises pivotally linked tie members by whose means the extended-nip press rolls have been connected together detachably by the intermediate of their bearing housings. The tie member is connected with either one of the bearing housings, e.g., the upper one connected to the upper roll in the nip or the lower one connected to the lower roll in the extended-nip press.
In the device in accordance with the invention, the extended-nip press rolls are joined together by their ends by means of two tie members. The tie members are placed symmetrically in relation to the vertical axis (Y axis) and can be selectively connected with either one of the bearing housings. As such, by means of the selective coupling, either the upper bearing housing or the lower bearing housing (and roll connected thereto) can be removed/serviced.
The invention will be described in the following with reference to some preferred embodiments of the invention illustrated in the figures in the accompanying drawings. However, the invention is not supposed to be confined to these embodiments alone.
The following drawings are illustrative of embodiments of the invention and are not meant to limit the scope of the invention as encompassed by the claims.
FIG. 1 is a side view of an extended-nip press arrangement of a paper machine/board machine.
FIG. 2 shows the extended-nip press arrangement viewed in the machine direction and partly in section.
FIG. 3A shows an extended-nip press arrangement in accordance with the invention with the rolls of the extended-nip press joined together at their respective bearing housings.
FIG. 3B shows the arrangement as shown in FIG. 3A viewed in the direction of the arrow K1 in FIG. 3A.
FIG. 4A is an axonometric exploded view of the parts of the coupling construction between the rolls in the arrangement shown in FIGS. 3A and 3B.
FIG. 4B illustrates the engagement of the cylinder S with the middle frame 21a2 and with the tie member 14a2.
FIG. 4C illustrates the engagement of the tie member 14a2 with the frame R2 by means of a screw, by means of which screw the tie member 14a2 can also be detached from the engagement with the frame part R2.
FIG. 5A shows an operation stage of the device in accordance with the invention in which the lower roll can be serviced.
FIG. 5B shows a stage of the method in accordance with the invention in which the upper roll can be lifted off, for example, for servicing, the coupling means remaining in connection with the bearing housing of the lower roll.
Referring to the accompanying drawings wherein like numerals refer to the same elements, FIG. 1 shows an extended-nip press arrangement of a paper machine. In the press arrangement shown in FIG. 1, a web W is passed into a nip N formed between a lower extended-nip press roll 11 and a back-up roll 10. The web W is carried on a felt H into contact with a roll face 10' of the back-up roll 10 in the nip N.
FIG. 2 shows the rolls 10 and 11 of FIG. 1 viewed in the machine direction. The extended nip between the rolls 10 and 11 is denoted in the figure by the reference arrow N. The felt H and the web W carried thereon are passed through the nip N. The roll 10 is a variable-crown back-up roll, and the roll 11 is an extended-nip press roll that comprises loading means 12a1,12a2 . . . The loading means 12a1,12a2 . . . , preferably cylinder means mounted on the central axle 13, are arranged to act with a force upon a loading or glide shoe 12b. The force is conveyed through a flexible closed glide-belt mantle F to the web W so as to remove water from the web. In the present invention, the term web W refers to a paper or board web. The lower extended-nip press roll 11 comprises a flexible closed glide-belt mantle F arranged to run along the face of the loading shoe, i.e., of the glide shoe 12b. An oil medium is passed into the space between the glide shoe 12b and the closed glide-belt mantle F to constitute the lubrication medium. The back-up roll 10 may be preferably a roll heated from inside by means of a heating medium, e.g., water, steam or oil, or from external sources, e.g., by means of induction or infrared heating. The back-up roll 10 may also be a non-heated roll.
FIG. 3A shows a coupling construction in accordance with the invention in a position between the rolls in an extended-nip press. In the arrangement, a first bearing housing 13a1, which is the upper bearing housing in the figure, and the second bearing housing 13a2, which is the lower bearing housing as shown in the figure, and, the respective upper and lower rolls mounted in the bearing housings 13a1,13a2, are interconnected by means of tie members 14a1 and 14a2. In a preferred embodiment, the bearing housings are interconnected by means of similar tie members 14a1 and 14a2 at both ends of the rolls.
FIG. 3B shows the coupling construction shown in FIG. 3A, viewed in the direction of the arrow K1 in FIG. 3A.
FIG. 4A is an axonometric exploded view of the parts of the coupling construction in accordance with the invention. The tie members 14a1, 14a1 ' connected both ends of the rolls.
The fastening construction in accordance with the invention is symmetric in relation to the vertical axis (Y axis). The coupling construction is also substantially symmetrical in relation to the second axis (X axis) perpendicular to the Y axis.
The first bearing housing, which is the upper bearing housing 13a1 as shown in FIG. 4A, includes a lifting bracket 15. The lifting bracket 15 comprises a bracket part 15a1 having a through hole 15a2 therein which mates with the loop of the lifting device, and a plate part 15a3 connected with the bracket part 15a1. Plate part 15a3 is attached to the frame R1 of the bearing housing 13a1 by means of screw means 16a1,16a2, . . . The screws 16a1,16a2, . . . are passed through screw holes 15b1,15b2, . . . into the frame R1 and are threaded into the threaded holes in the frame.
The bearing housing 13a1 comprises a lower fastening construction B1. The fastening construction B1 is symmetric in relation to the Y axis and comprises similar fastening-construction portions B1.1,B1.2. The frame R1 is preferably a cast construction. The frame R1 comprises a central opening M for the axle of the upper roll. In the figures, the bearing means on which the rolls revolve are not shown separately. The frame comprises a side face C1 and therein a plane surface T1. On the side face C1, there is a side projection 16 comprising a face C2. The face planes T1 and T2 of the faces C1 and C2 are preferably parallel to one another, and are connected by a coupling face C3 arranged inclined in relation to the planes C1,C2. The side face C1 comprises a screw hole 17a1 and, in a corresponding manner, the face C2 comprises screw holes 17a2,17a3. The face C1 further comprises a bracket 30a1,30a2 having aligning shaft holes D1,D2 arranged therein.
The frame R1 further comprises coupling means B1.3,B1.4 which are similar to one another and which are placed at both sides of the Y axis. For example, the coupling means B1.3 comprise a plane face T4 and therein a projection edge 18 which comprises screw holes 19a1,19a2 as well as a keyway 20 in the bottom face.
Further, the coupling construction comprises hollow middle frames 21a1,21a2, which are constructions similar to one another. In the following, one of these middle frames, the middle frame 21a1, will be described. The middle frame 21a1 comprises an upper wall 22a1, a lower wall 22a2, and side walls 22a3,22a4 which interconnect the upper and the lower walls perpendicularly and which comprise holes 23a1,23a2 for the shaft of the pivot cylinder S so that the cylinder S pivots about the shaft inserted through the holes 23a1,23a2. Between the side walls 22a3,22a4, there are side walls 24a1,24a2 between the upper and the lower walls 22a1,22a2. The side walls 24a1,24a2 comprise respective openings 25a1,25a2 (of which only opening 25a1 can be seen in the figure). The walls mentioned above define a hollow space E in the interior space between them. A hydraulic cylinder is arranged partly in the space by its cylinder frame so that the shaft connected with the cylinder frame is connected and linked pivotally in the axle holes 23a1,23a2. The upper and the lower walls 22a1,22a2 project by their ends from the side walls, and their projection portions comprise screw holes 26a1,26a2, . . . and grooves 26a5,26a6, . . . for the screws. Moreover, the upper wall 22a1 comprises a plane face T5 and therein a keyway 27a1 and, correspondingly, the lower wall part 22a2 comprises a plane face T6 and therein a keyway 27a2. In FIG. 4A, the screws or other fastening means which connect the middle frame 21a1,21a2 to its bearing housings are not shown separately.
The arrangement further comprises adapter pieces 28a1,28a2, which are construction parts similar to one another. For example, the adapter piece 28a1 comprises an upper planar face T7 and a lower planar face T8 and keyways 29a1,29a2 in the planar faces, respectively. Further, the adapter piece comprises grooves 30a1, . . . ,30a4 for receiving the fastening means, e.g., screws.
The lower, second bearing housing 13a2 comprises a frame R2, preferably a cast frame, and therein a central hole M2 through which the axle of the lower roll is positioned. The bearing housing 13a2 comprises upper fastening means B2.1,B2.2 which are constructions substantially similar to one another and which correspond to the fastening and coupling means B1.1,B1.2 of the upper bearing housing 13a1. Thus, they are constructions symmetric in relation to the central axis Y. Similar to the upper bearing housing, the fastening means in the lower bearing housing 13a2 comprise a first face C1, a second face C2 which has been raised in relation to the first face C1, and between the first and second faces, a third face C3 which is a coupling face. The face C3 is preferably an inclined face. Further, a fourth face C4 comprises a groove 300 for a bracket, and a hole 31 in the frame R2, whereby it is possible to pass a shaft 32 through the hole 31 and through a corresponding hole provided in the fastening bracket of the tie member which is placed in the groove 300 for the bracket.
The uppermost fastening portion B2.3,B2.4 of the upper fastening means B2.1,B2.2 are constructions similar to one another and similar to the fastenings B1.3 and B1.4 of the upper bearing housing. Further, the lower bearing housing comprises lower fastening means B1.5 and B1.6 which are similar to one another. The lower fastening means B1.5 and B1.6 comprise a plate 33b and grooves 33a1, . . . ,33a4 arranged therein for screws which enable the entire coupling construction to be fixed to a machine foundation P.
At the ends of the rolls, interconnecting the bearing housings, there are two similar tie members 14a1 and 14a2. Each tie member 14a1,14a2 comprises a middle frame 34a1 and side frames 34a2,34a3 at both ends of the middle frame 34a1. The longitudinal axes of the side frames 34a2,34a3 are substantially perpendicular to the longitudinal axis Z1 of the middle frame. The tie members 14a1,14a2 are elongate and symmetrically arranged in relation to the central axis X', i.e., the longitudinal axis. Each tie member comprises an articulation point N1,N2 at its ends, in which case the tie member can be connected optionally with either one of the bearing housings. A bracket 35a1,35a2 is arranged at each end of the middle frame 34a1. The bracket 35a1 includes a hole 36 through which the shaft 37 can be passed in order to couple the tie member with one of the bearing housings via an articulated joint.
In a corresponding manner, the other end of the tie member comprises a similar bracket construction 35a2 by whose means the tie member can be coupled optionally, via an articulated joint, with the other bearing housing. Further, the tie member 14a1, 14a2 comprises a handle, by whose means the tie member can be displaced by making use of an outside device. The middle frame 34a1 of the tie member comprises a rectangular, central opening 38 passing through the middle frame. Brackets 39a1,39a2 are arranged at respective sides of the opening 38. The brackets 39a1,39a2 comprise through holes 40a1,40a2 for a shaft to pass therethrough, whereby a pivot cylinder S can be coupled with the tie member by the end of the piston rod. The opening 38 is large enough to enable the cylinder S to pivot freely therein about the shaft inserted through the holes 40a1,40a2 upon movement of the tie members 14a1,14a2. Inside the U-section formed between the extending portions of the side frames 34a2,34a3 and the planar rear face of the middle frame 34a1, a wedge piece 41 composed of tin bronze is arranged against the side frames 34a2,34a3. The wedge piece has a coupling face D' which is preferably a cylindrical face having a curve radius r. The middle frame 34a1 further comprises screw holes 42a1,42a2 and 42a3 arranged on respective sides of the opening 38. Tightening screws 43a1,43a2 are passed through the holes 42a1 and 42a2, and a detaching and tightening screw 43a3 is passed through the hole 42a3.
FIG. 4B is an illustration on an enlarged scale of the engagement of the tie member 14a1 with the cylinder device S which serves to actuate the coupling construction. The cylinder S, which is preferably a hydraulic cylinder, is coupled by its cylinder frame S' with the middle frame 21a1. The middle frames 21a1 and 21a2 can be coupled by separate screw means (not shown) both with the upper bearing housing 13a1 and with the lower bearing housing 13a2. The coupling mentioned above also permits that the tie members 14a1,14a2 can be coupled operationally either with the upper bearing housing or with the lower bearing housing. When the tie member 14a2,14a1 is linked to pivot in relation to the upper bearing housing 13a1, when the coupling between the rolls is being uncoupled, the coupling means connected with the middle frame 21a1,21a2 are detached from the lower edge of the middle frame 21a1,21a2 (in FIG. 4B, this edge is denoted with O1 at the part 21a2). Similarly, if the tie member 14a1,14a2 is linked to pivot in relation to the lower bearing housing 13a2, when the coupling between the rolls is being uncoupled, the bearing means at the edge O2 are detached from the engagement with the upper bearing housing at the edge O2. Thus, the detachable middle frame 21a1,21a2 permits the above selective operation.
FIG. 4C shows the engagement of the tie member 14a2 with the frame R2 by means of the screw 43a3. The screw 43a3 is passed through the screw hole 42a3 placed in the tie member 14a2 into a threaded hole 101 in the frame R2. The screw 43a3 comprises a flange 102. The tie member 14a2 comprises a recess 105 in one of its faces and the flange 102 of the screw 43a3 is placed in this recess. When the screw 43a3 is threaded in one direction, the head 106 of the screw is threaded into contact with a plate part 103, and the tie member 14a2 is thereby pressed into contact with the frame R2. When the member 14a3 is detached from the engagement with the frame R2, the screw 43a3 is threaded in the opposite direction. In this manner, the flange 102 of the screw 43a3, after it has been turned so that it presses against the lower face of the plate part 103, lifts the tie member 14a2 apart from the frame R2. The plate part 103 is fixed to the member 14a2 by means of screws 104 or other fastening means.
FIG. 5A shows another embodiment of the present invention in an operational stage in which the tie members 14a1,14a2 are linked pivotally with the upper bearing housing and the tie members 14a1,14a2 are kept by means of the cylinder device S in a so-called open position. In this case, the lower roll and the lower bearing housing can be conditioned/detached upon release of the screws 43a2 from the frame R2 while the tie members 14a1,14a2 pivot about the articulation point N1 and remain connected to the upper bearing housing.
FIG. 5B shows a coupling construction in accordance with the invention in a mode of operation in which the tie members 14a1,14a2 are linked pivotally with the lower bearing housing and the tie members are kept in a so-called open position by means of the cylinder device S. By means of the cylinder device S, the tie members are brought close to the bearing housing to be coupled, and the ultimate fixing and pressing of the tie member against its back-up face takes place by means of separate screw means.
The examples provided above are not meant to be exclusive. Many other variations of the present invention would be obvious to those skilled in the art, and are contemplated to be within the scope of the appended claims.
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|U.S. Classification||100/153, 162/358.3, 72/238, 162/272, 100/168, 425/194|
|International Classification||D21F7/00, D21F3/02|
|Cooperative Classification||D21F3/0218, D21F7/001|
|European Classification||D21F7/00B, D21F3/02B2|
|May 13, 1994||AS||Assignment|
Owner name: VALMET PAPER MACHINERY INC., FINLAND
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VALLIUS, OIVA;REEL/FRAME:007001/0697
Effective date: 19940419
|Oct 6, 1999||FPAY||Fee payment|
Year of fee payment: 4
|Sep 29, 2003||FPAY||Fee payment|
Year of fee payment: 8
|Oct 22, 2007||REMI||Maintenance fee reminder mailed|
|Apr 16, 2008||LAPS||Lapse for failure to pay maintenance fees|
|Jun 3, 2008||FP||Expired due to failure to pay maintenance fee|
Effective date: 20080416